Anthony herman gerard fokker



A. H, G. FOKKER. ROTATABLE ARMOR PLATE FOR THE PROTECTION OF THE COOLERS 0F FLYING MACHINES.

APPLICATION FILED SEPT-1,1920.

Patented Aug. 30, 1921.

7 inaeznal'" Wz/W al Maw,

damage from shots T FM.

ANTHONY HERMAN GERARD FOKKER, OF AMSTERDAM, N'E'IBL'IEIRIALN'DS.

ROTATABLE ARMOR-PLATE FOR THE PROTECTION OF THE COOLERS OF FLYING- MACHINES.

Specification of Letters Patent.

Patented Aug. 30, 1921.

To all whom it may concern:

Be it known that I, ANTHONY HERMAN,

GERARD FOKKER, a subject of the Kingdom of the Netherlands, residing at Amsterdam, Netherlands, have invented certain new and useful Improvements in Rotatable Armor- Plates for the Protection of the Coolers of Flying-Machines, (for which I have filed application in Germany Oct. 1, 1918,) of which the following is a specification.

It is well known that, in order to protect the motors, apparatus, etc. etc. of flying machines, as well as the persons with which the latter are manned, from being hit by shots, armorplating .is provided. If the cooler should be attached at the head of such a flying machine, it would be necessary, in order not to interfere with its proper action, to place it outside the said armorplating, and it would therefore be unprotected against coming from a frontal or frontal-oblique direction.

For the purpose of obviatin this disadvantage, an armorplate is rigi y connected with the propeller, covering the cooler which has been installed behind the propeller. The armorplate is provided with slits of such shape that they transmit air to the cooler when the propeller is in rotation, in accordance with this invention.

The drawing represents the invention in different forms of construction, whereby Figure 1 represents a lateral view.

Fig. 2 a frontal view of the whole of the device.

Figs. 3 and 4 a frontal-view of the propeller with armor-plates of different shape.

One or two armor-plates b have been rigidly connected with the propeller a and therefore rotate together with the latter upon the armored shaft. Said plate or plates have been provided with slits 0.

These slits are of such a shape, that they cause the air to pass to the cooler d, installed behind the propeller.

The device can also be attached to flying machines which have been provided with a rear-propeller instead of a frontal-propeller, where the cooler has been installed in front of the propeller. In this case the slits in the armor-plate may be given such shape, that they yield, when the propeller is in motion, a pressure-effect, or they are shaped in such a manner, that they produce a suction action.

Having fully described my invention, I claim:

In a flying machine, a cooler, a propeller contiguous to and spaced from the cooler, and an armorplate secured to the propeller for rotation therewith and also arranged contiguous to and in front of the cooler, said armor plate having openings.

ANTHONY HERMAN cream; FOKKER. 

